Rock-drilling engine.



No. 783,638. PATBNTED PEB. z8, 1905.

Jj. G. LEYNER. ROCK MILLING ENGLINE.

APPLIOATION FILED SEPT. 2, 1903.

' w|| y i Vi PATENTED FEB. 28, 1905.

4 EHEETB--BHEET 2.

J. G. LEYNER.

ROCK DRILLING ENGINE.

APPLICATION I'ILED SEPT. 2, 1903.

PATENTED FEB. 28y 1905.v

J. G. LEYNER.

ROCK DRILLING ENGINE.

APPLICATION FILED SEPT. 2, 1903.

4 SHEETS-SHEET 3.

VIE... lxN r|| um. M\

PATENTED FEB. 28, 1905. J. G. LEYNER.

ROCK DRILLING EN-GNB.

APPLIUATION FILED SEPT. 2. 1903.

4 SHEETS-SHEET 4.

Flo. 7593.155313..

.mini erronea termen,

Fatenteul February 2213*, 11,9091.

@F DENVER., UULORAD.

Wlltwlmllmtillhtlllltiti lEltlltEilllilIlE..

SPECIFICA'FXUN forming part ot' Letters Patent No. "ml, dated. February 2F, 119055.

Application filed September 2,1903. Serial No. 171,624.

Be it known that l, .loan Geenen Lernen, a citizen ot' the United titates ot America, residing in the city and county or' Denver and State ot' Colorado.' have invented certain new and useful Improvements in Rock-Drilling lngines; and l do declare the following to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to which it appertaina to make and use the same, reference being had to theaccoin panying drawings,'and to the tgures oi' reference marked thereon, which iorm a part oi' this si'iecilication. f

`l1/l v invention relates to improvements in roclvdrilling engines; and the objects ot' my invention are, iii-st, to provide means for autoi'natically starting the l'low of water when the drilling-engine is started and 'tor stopping the li-ow of water when the drilling-engine is stopped; second, to provide a combined air and spring controlled valve for controlling the supply and flow of water through the rockdrilling engine to its rock-cutting drill-bit; third, to provide means tor adjusting the pressure of the water-controlling valve against its seat; fourth, to providea small compact light-weight rock-drilling engine ot' great rockedrilling power. ll attain these objects by thel mechanism illustrated in the accompany? ing drawings, in which` Figure 1 is a plan view of a rocledrilling engine embodying my invention. Fig. 2 is a side elevation of Fig. 1. Fig. 3 is alongitudinal central section oi'- Figs. 1 and 2. Fig. if is a rear end'elevation of Figs. 1 and 2. Fig.

is a section ot'Figs. 1 and 3 on line 5. Fig. 6 1s a section of Figs. 1 and 3 on line 6 6. Fig. 7"

is a fragmentary section or' Fig. 3 on line 7 7. Fig. 8 is a section through Fig. 3 on line 8 8. Fig 9 is a section of Fig. 3 on line 9 9. Fig. l() is a section ot' Fig. 2 on line 10 10. Fig. 11 is an end elevation ot' the rear cylinder-head. Fig. 12 is a section of Fig. 11. Fig. 13 is a side elevation of the drill-holding chuck. Fig. 14C is a side elevation ot' the drill-bits pawlholding piston. Fig. 15 is a central longitudinal section ot' Fig. 14:.'VU Fig. 16 is a see.- tion through the pawl-pistons cylinder. This view is also a cross-section on line 8 8 oi Fig.

y 3 through the lront cylinder-heamas this transversely-arranged pawl-piston cylinder `terms a part of thefront cylinder-head- Fig. 17 illustrates a perspective view of the drill-chuck, a fragment of the hammer-striking end of the drill-bit, and a perspective view of the chuckchuclc. Fig. 155 is a side elevation ot' the roel(- cutting drill-bit which llpreferably use in my rocledrilling engine, and Figlg is a perspective view ot the chuck-ring wrench which is used to turn the chuck-ring and unlock the drill-bit, from the chuck whenever the drill-bit gets stuck in seams in roclr while drilling them. Fig. 2O is an enlarged sectional View through tapered plug seated in a tapered bore therein, which is adapted to clamp and hold one end ot' the water-tube, the rear cylinder-head and a portion ol2 the cylinder being shown in dotted lines. Figp2l is a transverse sectional view on the line 21 21 ot' Fig. E20, showing a screen which is secured within an annular recess in the hub of the disk, the said screen being designed to cover a plurality ot' holes which Vform a communication between the annular' recess and the bore ot' the dislr. Fig. 9.2 is a side elevation ot' the disk, clearly showing' the annular recess in its hub portion and` the screen secured therein. Fig. is a perspective view ot' the tapered plug which is seated in the tapered bore ot' the disk; and Fig. 2a is a ltransverse sectional View thereof, more fully showing the slots which extend from its longi tudinal bore through lits periphery.

Similar figures o1 reference reier to similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates the cylinder ot' my improved rocltdrilling engine.

lhe numeral 2 designates the valve-chest, which is formed integral with the cylinder. Suitable air inlet and exhaust ports 5 and 6 are formed in theeylinder, which extend from the central portion of the cylinder to its opposite ends, and a center port 7, that is positioned between the ports 5 and 6. The ports 5 and 6 connect by lateral ports 5^ and 6A with the ports 8 and 9, both of which lead to the front end ot' the drilling-engine., as will r-ing by which the drill-bit is locked to the the water-tube-supporting disk, showing a be explained hereinafter. '.lhe 'valve-chest is provided with air-inlet ports 10, 11. and 12 and with exhaust-ports l?) and 14. 'lhe ports 1() and 12 register with the ports 5 and 6. 'l'he port 11 forms the air-entrance port into Athe valve-chest and registers with an inletl formed in projecting' hub 11"` the entrance to which is interorly threaded. '1 he exhaust-ports 13 and 14 register with outlets formed in projecting hubs 13A and 14". A valve 15 is operatively mounted in the valve-chest and is provided with collars 16. whicli are arranged on a stem 17 to control the ports 10. 11, 12, 13, and 14. An operative piston 19 is reciprocally mounted in the cylinder and is provided with a circumferential recess 2O at the central portion of its lengt-h, which connects with ports 20", 202200, and 20", which cooperate with the ports in the valve-chest to operate the valve and piston. An airport 18 extends from the air-inlet port 11 (see Fig. 10) rearwardto the end ofthe cylinder, where it intersects a. recess in the rear cylinder-head,

which i will fuily describe hereinafter.

.ihe cylinder 1 is provided with a rear cylinder-head 21. 'ihis rear cylinder-head is a cylindrical hood -shapcd member. A circular flange comprises the inner end of this cylinder-head, and this flange abuts against the end of the cylinder. The peripheral edge and back of the flanged end ot' the rear cylinderhead is provided with a right-angled stepped shoulder 22. i preferably secure the reai cylinder-head to the cylinder by means of a ring23, the inner peripheryT of which is provided with a thread that screws onto a thread formed on the adjacent end ot' the cylinder. ',ihe outer end ot' this ring 23 is provided with an open-ended flange portion 24, that extends over the body ot the rear cylinder-head and f iits in and against the stepped shoulder 22 ot' the rear cylinder-head. By removing' the ring the cylindeuhead may be turned to perniit its water-coupling inlet to be turned to stand on either one side or the other et' the drilling-engine.

24" designates the front cylinder-head. '.fhis cylinder-head is also a hood-shaped cylindrical member which is preferably threaded to the cylinder by a reduced shouldered threaded end that screws into a threaded counterbore termed in the end et the cyiini the front cylinder-heul i der. l wili describe more Tully hereinatter.

Ilhe bottom et' the cylinder adjacent f rear end is provided with a depending' lug .25. l

through which nut is extended. is provided with a shouid er 27 at one end, which bears against one end ot' the depending lug.I

while its opposite end extends through the ing and is threaded, and uut 28 threaded to it and screws gainstthe pposite endo pendingl thus r' securing tl the lug. YShe interior this nut d a iong eed-sere is thread *rasees to it. @ne end of this screw extends rearwardly ot' the cylinder. and its extreme end is provided with a thread, and adjacent to this th read ed end a collar 2)() is formed. '1 he threaded end ot' the feed screw extends loosely through a hole 30", formed in the center of a cross-bar 31, and the collar 30 extends into a counterboredhole 30B, formed in the cross-4 the slot and clamps the threaded hub of the crank to the end ot' the feed-screw, thus additionally securing the crank to the feed-screw. 'lhe cylinder is also provided with a depending portion, on the opposite sides of which are formed slideways 34 and'. 'lhese slideW-ays form an integral part ot the depending lug 25. rihese slideways are litted slidably in the guideways 36 and 3? oi a supporting-shell 38. This supporting-shell is preferably longer than the cylinder and forms the supporting base for it. Adjacent to its forward end an outwardly-diverging hub 39 is formed on its bottom. which is adapted to be clamped to the chuck ot' a. stoping-bar or a tripod. which de not iliustrate. To the opposite sides oi the rear end ot the shell secure one of the ends of two rods 40 and 4i. y1`hese rods extend rearwardly trom the sheii. and 'their opposite ends are secured to the opposite ends ot' the crosshar 31. to the center ot which the crank end ot the feed-screw is rotatabi y secured. The cylinder is adapted to be ted reciprocally through the sheii 'by the feed-screw. 'the cylinder is provided with a piston-bore 42., in which reciprocaily iit hammer-piston 19. rThis ham nier-piston comprises a piston-head 44 and a hanuner-bar extension 45. which is termed integral with the piston-head. This hammer-bar extension projects forward from the frontend ot' the piston into a sleeve 443., which is rotatably mounted in the afiiai horeotthetront cyiinderhead. as wil be telly explained hereinafter. in the front incl ot the cylinder i 'form counterbore of' iargerdiameter than the pistons ht a steel butter-ring 4S. Ander-ring. against rubber ring piace supn i binder-ring 50. which. is poountcrbore 51. which 1 preter- 1 diameter than the counter- 4e and 49 placed. rews into the cylin i 55., that termed and up gamst the abutment the l .iese rings surround IIO controls the admittance ot' water/to the waterpipe when thc drilling-engine is running by means of a supply of air that l'lows to it from the port 11 of the valve-chest through theports 18 in the shell or casing of the cylinder,

where it intersects a circumferential recess 18"", that is formed in the face of the ilange of the rear cylinder-head. From .the top of this recess a horizontal port-hole 18B is drilled into the head` which is intersected hy ayertical port-hole drilled downward from the top of the flange of the rear head. Thisrhole 18 intersects a horizontal port-hole 18', drilled into the rear cylinder-head fr'om its cylinder to opposite the inner end ot' the valve-stcnis operating-piston, where it intersects a vertical port-hole 18, drilled through the shell of the rear cylinder-head close to the partition at the rear of the piston. As l preferably drill the several holes that form this air-port, it is necessary to plug their entrance ends with plugs after they are drilled. end ot' the valves actuating-piston is provided concentric to the valvestcin with a slightlyprojecting huh portion that strikes the partition., which leaves an annular space between the back ot' the piston and the partition, that registers with the entrance to the air-port and permits the air to iiow directly around the end ol" the piston.

Un one side oi" the rear cylinder-head a pro- ,iecting huh 82 is Ar'orrncd. in which a waterinletaperture is formed. (See Figs. ll and l2.) he end of this water-inlethuh is threaded to receive a hose-coupling'. 'l`he waterinlet aperture in this hul) extends only a short distance into the rear cylinder-head, and from its bottoni a passage Sli extends into the valvechamber 5t of the water-pipe.

ln order to prevent sand, grit. or any sediment in the water troni reaching the valveseat, l place a tine-mesh screen 85 around the huh ot' the Water-pipe-supporting disk., pret'- erahly secnring in place by soldering it to the hun, and in order that the water may have a large space all round the screen and clear access to all the apertures in the shell or' the hoh alter it has passed the screen torni a circumferential recess 85" around the hule, and 'the apertures are placed in the bottom oi this recess. lhe rear cylinder-head can he turned on its seatagzainst the cylinder to allow the water-inlet-hose-coupling hub to he placed on either side or on the top or bottom ot the axial center of the drilling-engine in order to allow the water-supply hose to be connected to it at either one o'l' the four sides olI the drill in the most convenient position hy loosening tle ring 23. which is provided with shallow loles 23^ in periphery.j in which suitable spanner-wrench may be The front placed, with which the ring may be screwed on or ofi'. The air-.port ,recess ISAfbeing arranged entirely around the flange of the rear cylinder-head to permit the head to be turned for this purpose and in order to permit the water-inlet coupling to be turned accurately to the opposite horizontal and verticalquarter-points of the axial center of the drillingengine, I secure a dowel-pin 86 in the end cylinder and forni four holes 87 at the yerti cal and horizontal quarters of the rear cylin-l the cylinder-head. rlhis right-angled-disposed cylinder extends, preferably. an equal distance on each side'of the axial center of the front cylinder-head. rlhc opposite ends oi' thiscylinder are slightly counterbored and are interiorly threaded. and cylinder-heads 87A and 88 are threaded into the ends oi' the cylinder. ln the bore ol' this cylinder -a pawl-carry'inir piston 89 is slidably litted. Lhis piston isa' little shorter than the cylinder and has buta short stroke therein and is operatively reciprocated by the actuating iluid used to operate the rock-drilling engine, which is preferably compressed air, which iiows to the opposite ends of the nawl-piston cylinder.v from the ports 5 and 6 the piston-hainniei"s cylinder througn the ports t5 and 9., which extendV from these ports through the shell oi" the cylinder front cylinder-head to the pawl-pistons cylinder. rlhe ports 8 and 9 are arranged on opposite sides ot the main cylinder and extend to the opposite ends of the pawl-piston cylinder, and as these ports are rather crooked will describe the course ot port il. As the naval-piston is a small light piece oi' steel., the power required to reciprocate it in its cylinder is but a tr'i'ie. lhe ports are small paswhich l ire'lerahlymake hy drilling holes in the shell 'to torni the ports., and as both ports are exactly alike, except that the port ll is a little longer than the hert 8. a description ot' one will apply to the other. rllhe end 90 oi' the port il is drilled into the shell ot the cylinder from 'the shoulder 9i 'at the bottoni ol the connterhore l? in the liront end ot' the cylinder. rlhe end portion 9G ol' the port i5 is intersectcd hy a. short inclined yern tical hole 953., which is drilled' from the ton of the cylinder downward toward the axial cenof the mais cylmdcrinto the nort 8. Y This vertical portion et' the port 8 is tersected by a horisontal'hole Sie. which is drilled' into J" "i nt end the cylinder. The portion of thc'port 'z3 is intersected the end el ICO IIO

the cylinder by a vertically-inclined hole 959 which extends downward from the top of the cylinderl and through the same into the front cylinder-head, where its lower end is intersected by a horizontal hole 96, which is drilled into the adjacent end oil the front cylinderhead. The hole 90 is intersected by a horizontal hole 97, that is drilled into the side@ of the :front cylinder-head at substantially right angles to the hole 9o. The portion 97 is intersected by an inclined hole 98., that is drilled from the top ot the front cylinderhead into the pawl-piston cylinder. listhe liront head screws into the cylinder provision must be made to bring both parts of the hole 95 'to connect. l accomplish this by lorming short circumferential recesses 92 in the periphery of thc threaded end of the cylinderhead., which provides an odsetting passage that permits a clear passage even if the cylinderhead is screwed not quite to or beyond the position it occupies when the hole is drilled. llhe only did'erence between the port El and the port 9 is that the port 9 extends along the opposite side of the cylinder and that the portion99 ot' the portion 9 which corresponds to the portion 90 ol the port c extends to the port o. rthe air enters and exhausts from the pawl-piston cylinder through the ports 8 and 9 and reciprocates the pawl-piston therein. 'llhecenterotl the pawl-piston is provided with an oblong aperture 101. which extends transversely through its axial length and which is positioned to surround the axial center ot the main cylinder'. This oblong aperture 101 is longest along the length of the pawl-piston,

Ll Fi and in the central portion of itsinner peripl ery recesses 102 and 103 are formed-one at the top portion and one at the lower portion of the aperturein which are pivotally secured and positioned pawls 10a and 105. sluit- 'able springs 106 and 107 are arranged in the piston to bear resiliently on the tooth end ot' the pawls. Either coiled springs or wire springs or blade-springs may be used for this purpose, and they may be arranged in any suitable manner; but l preferably use the spring-wire springs illustrated. Une end ot' each ot' these springs may be secured to the piston by any suitable means.y while their opposite ends are arranged in the recesses 102 and 103 to bear resiliently against the pawls.

'll -illustrate but two pawls; but more can be used it' desired. ll arrange these pawls and the receiving-recesses in diametrically opposite corners ot' the aperture in the piston. 'lhe tooth ends of the pawls 101 and 105 bear operatively on a circumferential row of ratchet- ,teelth 108., that are formed inthe peripheral surface o1 the drill-holding chuck a6. This d rill-holding chuck comprisesa tubular sleeve member., which is rotatably mounted in the axial bore ot' the front cylinder-head. lhe bore ol the front cylinder-head is made-in two diameters., the innerdianneter being thelargest.

rlhe chuck is also made in two diameters and is inserted in the cylinf'ler-head from its main cylinder' cnd its larger portion fitting in the larger diameter ol the bore in the cylinderhead and fitting rotatably between the shoulder at the bottom ot' the countcrbore and the steel butler-ring. The thrill-holding` chuck provided with an axial bore ot' two diameters 110 and 111., the bore 111 o'l1` which is the largest and is made to surround loosely the piston-hammer, which reciprocatcs in it. rll`he smaller bore 110 ol the drill-chuck is adapted to receive loosely the shank end ol the drillbit. '.lhe outerend ot thedrill-chuck extends slightly beyond the en d oli' the iront cylinderhead and is arranged to receive the shank end vo' the rock-cutting d rill-bits in such a man-.

ner that they are locked to it and are rotated by it, but at the same time are Jree to be almost instantaneously inserted into and withdrawn from it. lhe outer end ioi the trent cylinder-head is threaded., and a shoulder 112 is formed at the end ol" the thread. 1 cap 113 is threaded to the threaded end ol the cylinder'. .lhe drill-bit-receiving end of the chuck is bit'uicated diametrieally to 4torna the slots 11a and 115. (see lllig. 17,) and the opposite ends 116 and 119 are provided with step portions 119 and 120, oi less diameter. that extend circnmli'erentially around each end about one-hall oi' its semicircular periphery.

The drill-bit 79 consists ot' a shank portion 122 and any suitable rock-cutting end portion 123. rllhe shank is provided adjacent toits end with projectinglugs 123", two, preferably. being used. which are formed on diainetrically-opposite sides oi the shank. and are arranged and adapted to slip loosely into the slots 11a and 115 in the end of the chuck and to bear against the sides ol the chuck. ',lhe shank of the drill-bit h'ts loosely in the end of the chuck, and its shank 122 extends through the axial bore 110 oil the drill-chuck into the reciprocal path ot' the piston'js hammer-bar, which when the drill-bit is in operative position in the chuck strikes against its end on each and every forward stroke it makes in the cylinder. The drill-bit is thus seated in the chuck in such a manner that it can move axially independent ot' the chuck, but cannot molve rotatively except when it is moved by the chuck which rotates step-by-step with the piston and carries the drill-bit with it, as will be more 4fully described hereinafter. rll`he projecting lugs on the shank ot' the drill-bit are made enough shorter than the length ot the bifurcation in the end oll the chuck toallow the drill-bit a predetermined axial movement of about three-eighths to liveeighths ol an inch., and in order to confine the axial movement ol" the drill-bit under the varying conditions ot' the forward feed of the drill-cylinder in the shell and the variable 'forward movement ot the drill-bit under the blows of the piston it is necessary to lock it IOO igo

in the chuck in such amanner that it can move axially about this distance independent of the chuck. For this purpose l employ a chuckkey 127, which is seated in a sleeve-ring 128, that fits loosely -in the cap 113. This ring fits betweezr the end of the 'front cylinderhead and asteel ring 129, and between this steel ring and the bottom of the cap a rubber buffer-ring 130 is placed,which l term the chuckbuffer. The chuckkey ring comprises a round narrow ring Which is provided with an axial bore of two diameters 132 and 133. The bore 13 2 is intersected by diametrically oppositely-arranged axial slots 134 and 135, which extend in depth to the surface of the largest axial bore, (see Fig. 17, in which a perspective View of the chuck key-ring is shown,) thus dividing the smallest diameter of the bore into two oppositely-arranged semicircularlug portions 136 and 137, the axial center of which is provided with the arcs of an axial bore that is adapted to allow the shank of the drill-bit to extend loosely through the ring- 'key, while the slots permit the lugs on the drill-bit to pass through the ring-key. lhe side of the ring that faces the chuck bears loosely against the end of the'chuck, and is provide'd with two projecting lugs 138 and 139, which are arranged diametrically opposite each other. and are adapted and arranged to project loosely" over the steps 119 and 120 and to engage the shoulders formed by the junction of these step portions with the larger diameter of the ends of the chuck when the chuck-'key ring is turned toward them and to strike against the sides 140 and 141 of the oppositely-arranged ends when turned in the opposite direction. When the chuck-key is turned so that its lugs strike the shoulders formed by the steps 119 and 120, its slots are in line `with the slot through the ends of the chuck, and the shank of the drill-bit can be l, inserted into its operative position with its ring and turn itin either direction.

lugs in the chuck. The key is then turned until its lugs strike the sides 140 and 141, and its slot will then stand at right angles to the slot 'in the end of the chuck and to the lugs on the drill-bit, and the drill-bit will then be keyed in the chuck againsty axial displacement, but will still have an axial movement in the ,chuck sufficient for operative action. :The chuck-key can be turned in either -direction instantly with the wrench 142, which is provided at one end with oppositely-arranged right-angled lingers: 143 and 144, that are adapted to iit in the slots of the chuck-key 1t is not necessary for the operator to look to see if the key-ring is in line with the slot in the chuck when he wishes to insert a drill-bit. He simply inserts by hand the shank of the drillbit in the key-ring and chuck, passing the projecting. lugs on the shank'through the radial slots in the key-ring and into the slot in the end of the chuck. After the shank ofthe drill-bit has been inserted in the chuck and its projecting lugs have passed through the radial slots in the key-ring should the slot in the end of the chuck not be in alinement with the lugs a slight turn of the drill-,bit by the operators wrist will move thelugsinto alinement with the slot, so that they can be inserted. When the slots are in alinement, the side lugs of the key-ring rest close to' or substantially against the shoulders ofthe reduced portion 119 at the end of the chuck, and after thc d rill-bits projecting lugs have been insertedinto the slot at' the end of the chuck the operator gives the dri ll-bit andthe chuck a short quick turn in the direction that will rotate the chuck on its ratchet-teeth far enough to bring the shoulders 140141 of the chuck against the shoulders of the side lugs of the key-ring, which is prevented from rotating with the chuck hy the friction of its surrounding ring 128. l`hedrill-hitis then locked to the chuck, as the slot in the chuck and the projecting lugs on the drill-bit then stand at right angles to the slots in the key-ring. The drill-hit is thus practically instantaneously inserted and locked by the hand of an operator to the drilling-engine. To unlock the drill-bit, therightangled iingers of the wrench are inserted in the radial slots ofthe key-ring, and it is turned until its side lugs strike the shoulders on the reduced portion of the chuck, which brings the slots of the key-ring in alinement with the slot in the chuck, and consequently with the lugs of the drill-bit.

I employ a hollow rock-cutting drill-hit in my rock-drilling engine. rlhis drill-bit is provided with an axial hole 121", extending through it from end to end, as shown in Fig. 3, and when it is secured in its operative position inthe drill-chuck it is in the reciprocal path of the piston and the free'end of the waterconveying pipe projects into it. The axial hole in the drillbit being formed enough larger than the diameter of the pipe to permit a supply of compressed air from the cylinder to flow into it and mingle with water discharged from the water-pipe, as suflicientconipressed air passes along the hammer-har by the looselyfitting butter-rings and also through the axial hole in the piston, through which the water-pipe projects for this purpose; but in order to have a positively suiiicient supply of compressed air from the cylinder iiow directly into the Iend of the drill-bit l provide the hammer extension of -the piston with a channel orgroove 139", which extends from the frontend ofthe piston to theend of thehammerbar and forms a direct passage from the cylinder to the hole through the drill-bit, where it mingles and mixes with thc water discharging from the water-conveyingpipe, and together they are discharged by the air-pressure at each reciprocal stroke of the drilling-engine in spray-like puffs from the cutting-point of the drill-bit into the'bottoms ot' holes in rock, as

IOO

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they are being drilled and wash out the rockeuttines from the holes as fast as they are made, thus keepin g; the hole clean and at the same time allaying the dust. The piston-hammer strikes directly on the shank end olE the drill-bit, and sutleient clearance is formed in the front cyl indenhead and its cap between the projecting shoulder-lugs ot' the drill-bit and the key-ring to permit oli a practical independent longitudinal working movement of the drill-bit, and the d rilling-engine is fed 'forward by means ol the feed-screw just fast enough to keep the drill-bit in operative strikilugl relation to the rock and to the full blow ol lthe piston-ham: mer. When, however', the drill bit not against rock, its forward impingements are received by the butler-ringq in the cap, while forward strokes ot' the pistcn-hammer are received by the butler-rings at the forward end of the cylinder.

The valve mechanism herein illustrated and its operation,as well as that ol the piston-baur Amer and the drillbit, are very clearly illusn trated and described in my Patent No. 709,022, dated September 16, 1902, and it is only necessary to mention here that in the preferred construction, which is herein illustrated, the actuating lluid, which may be either air or i steam, enters the valve-chest through a pipe or hose which is connected tothe entrance 11A and enters the inlet-port 11, while the oppo site end ot' the hose leads to a supply ol'I com-v well-known manner and as described in the above-mentioned patcnt rllhe operation ot' my automatic air and spring controlled water-governing valve is as t'ollows: its the air flows continuously to the valve-chest ot' the drilling-engine when turned on to start up and operate the drilling-engine,

i there is always an ai r-prcssu re in the port 1l,

and a portion ot' this air llows constantly through the port 1 8 to the water-valves stemactuating' piston and moves itag'ainst the thimble, and this piston by bearing' against the collar of the valve-stein, which held against it by the spring' 69", also moves the valve-stem away from its seat against the water-pipe, and as the airqn'essure against the val ve-actuating piston is continuous the valve is held open as long as theair is turned on the drilling-engine and it is kept running. lhe water-inlet valve is held open by the air pressure on its piston, and when the airis shut oll trom the drilling-engine the valves piston is pushed back against the partition 61 by the 4Jfeature is el.2 essential. value, as` it economizes in the use ol'l water in extensive underground or quarry or railway work, where good clean water is scarce, and there is also economy 1n the use ot' water when shittingl the position of the drilling-engine from one hole to another and when changingdrill-bits. The screen also protects the valve-seat from any sand or librous matter there may be in the water. 'llhe handie at the outer end of the valve-stem allows the valve-stein to be pulled back and turnedv around on its seat should it stick o-r any substance should get on the seat that would prevent it from closingl tight.

lll/ly improved rock-drilling engine represcntsa simple, durable, compact, light-weight, thoroughly practical recit-drillingengine that will drill with the use ol' but little air-pres sure the largest and deepest holes required in blasting' rock in mines, quarries, railroads, and other work.

As the air passes through the ports 5 and G a portion et' it enters the ports 8 and 9 in alternate order and ilows to the ends ot the pawls piston-cylinder 86 and reciprocates the pawlspiston therein, the air exhausting' back through the ports 8 and 9 and 5 and il to the atmosphere as the piston reciprocates, causing` the pawls to engage in alternate order the ratchetsti-ieth ol the drill-chuck. rlhus the pawl 104i on its lorward stroke pushes against the tooth lOlin thed irection ol the arrow it" and rotates the chuck a distance equal to the stroke ot' the piston, while at the same time the pawl 105 is moved backward in position to erugapge a ratchet-tooth at the opposite side ot' the drillchuck and moves against-it on the opposite` stroke of the pawl-piston and again turns the chuck a distance equal to the stroke ol the piston and pawl. ll preferably make each tooth oi the ratchet ot' the chuck ol a little less length than the stroke ofthe piston, so that the pawls will surely drop ofi' of them at each stroke olf the piston and positively turn the chuck. Vlt desired, however, the pitch ot' the teeth may be made line enough to permit the pawls to operatively ride over two or more teeth ot' the drilbclnicks ratchet-tooth portion at each reciprocal stroke of the pawls piston.

'llhe reci )roca'tive movennentol'I the pawl-piston and its pawls thus rotates the drill-holding" chuck at each stroke ot' thc hammer-piston, as the top pawl is forced to turn "the chuck by its pistons movement caused by the llow ot' air throng-h the port 8 into its cylvinder whe/nthe piston-hammer moves baek- IOO ward, and the bottom pawl 1s 'forced to turn the chuck by the opposite stroke oli' its piston when the air flows into the port 9 on the forward stroke of the piston-hammer, thus rotating the drill-bit-holding chuck and the rock-cutting drill-bit which is locked to it step by step at each/ stroke or blow of the piston-hammer. The drill-hold ing chuck and the drill-bit which is locked to it are thus rotated step by step at each and every stroke in.

either direction the hammer-piston makes in its cylinder by a portion of the actuating fluid operatively reciprocating the-pawls piston in' unison with it.

My invention lgreatly simpliiies the mechanism commonly used on drilling-engines for intermittently rotating rock-cutting drill-bits.

` It is also strong, durable, and not liable to get out of order.

Having described my invention, what l claim as new, and desire to secure by Letters Patent, is--- l. A Huid-pressure drill, comprising a cylinder, a piston having a longitudinal bore, a

hollow tool, a water-supply pipe extending' into the bore of said piston, and means independent ol' said piston Jfor rotating' said tool, as set forth.

2. Alluid-'pressme drill, comprising a cylinder, a piston having a longitudinal bore, a hollow tool, a water-supply pipe extending into the bore of said piston, a Valve for said pipe, and means` whereby'the pressure fluid opens said valve when the drill is in operation` as set forth. Y

' 3. A fluid-pressure drill, comprising a cylinder, a piston having a longitudinal bore, a

a hollow tool, a water-supply pipe extending into the bore of said piston, a valve for said pipe, and a piston whereby the pressure fluid opens said valvewhen the drill is in oper-ation,

.as set forth.

4. A fluid-pressuredrill,comprising a cylinder, a pston having a longitudinal bore, a hollowl tool, al water-supply pipe extending int-o the bore of said piston, a valve for said pipe, an'yadjustable spring for closing said valve-piston for manually operating said lvalve, as set forth.

6. Ina rock-drilling engine, the combinaftion with the cylinder and the piston, of a rear cylinder-head having an axial bore in the c vlinder end of said cylinder-head, an axial bore in its outer end, a partition between said axial bores having an axial aperture registering with each bore. a water-inlet hub on said cylinder-head arranged to be connected to a pipe or hose leading to a water-supply under'pressure and connected to the cylinder-bore of said cylinder-head, and means for'securing said cylinder-head to said cylinder, substantially as described.

7. In a rock-drilling engine, the combination with the cylinder, the piston provided with a longitudinal aperture extending through it and a rock-cutting drill-bit operatively supported in said drilling-engine and provided with a passage leading to its cutting-point, of a rear cylinder-head, means for secu-ring said cylinder-head to said cylinder, a water-conveying pipe secured at one end in the rear end portion of said cylinder and having its opposite end extending through the aperture in said piston and arranged to register with a passage leading to the cutting-point of said rock-cuttingdrill-bit,a suitable valve arranged to control the entrance to said pipe, means for keeping said valve and said entrance to said pipe closed when said drilling-engine is not in operation and means including a port or passage extending from said cylinder to said valve adapted to admit a supply ot' the drilling-engines actuating Huid foropening said valve and for holding said valve open when said drilling-engine is in operation, substantially as described.

8. In a rock-drilling engine the combinai tion with the cylinder having a water-conveying pipe Aextending through its center, -of the piston reciprocally mounted in said cylinder and on said pipe, the rock-cutting drill-bit operatively supported by said cylinder'and adapted to be struck by said'piston and provided with a passage leading to its cuttingpoint arranged to register with said pipe and the rear cylinder-head removably secured to said cylinder, a water-inlet in said cylinderhead. connecting with said pipe, a valve operatively mounted to control said water-inlet and for keeping it closed when said drillingengine is not in operation, and means including a port or passage arranged in operative relation to said valve, and adapted `to admit a supply of said drilling-engines actuating liuid, for opening said valve when said drilling-engine is started up and for holding said valve open while said-drilling-engine is in operation, substantially as described.

I 9. In a rock-drilling engine, the combination with the cylinder and the piston provided IOO IIO

with an axial aperture extending through it and a hollow rock-cutting drill-bit, of a rear cylinder-head, means for securing said cylinder-head to said cylinder, a borein the opposite ends of said cylindei"-head,`a portion between said bores having an axial aperture, a thimble-shaped nut threadedly secured in the outer end of said cylinder-head having an axial bore, a valve-stern slidably supportedin said nut and partition and extending beyond each,

seat, means including a port or passage adaptrsaess im a handle on the outer end of said valve-stem,

a plug-valve at its inner end, a water-supply pipe secured at one end at the rear end of said cylinder, `and having its opposite end project loosely through said aperture in said piston and into said rock-cutting drill-bit, a valveseat arranged to control the entrance to said pipe and adapted to receive and seat said plugvalve on said valve-stem, a water-inlet in said rear-cylinder-head connected with the valved entrance to said water-pipe, means tor lreeping said valved entrance closed when said drilling-engine is not in operation and means including a piston and a port adapted to permit asupply ot' the drilling-engines actuating fluid to the piston for holding said valved entrance to said water-supply pipe open when said drilling-engine is in operation, substantially as described.

l0, ln a rock-drilling engine, the combination with the cylinder and the piston reciprocally mounted therein and provided with an axial aperture, of a rear cylinder-head detachably secured to said cylinder, a water-conveying tube secured to the rear end of said cylinder at one end and projecting into the axial aperture in said piston, a valve arranged to control the inlet to said water-tube, a waterinlet in said rear cylinder-head registering with the inlet to said water-tube, a spring arranged to normally 'hold said valve closed and means including a port extending trom said valve-chest to said valve for holding said valve open when said drilling-engine is running, substantially as described.

lll,x lin a rock-drilling engine, the combination with the cylinder and the piston having an axial aperture therein, oln a rear cylinder-head detachably secured to said cylinder, a waterconveying tube extending into the airial aperture of said piston, means for relcasably securing the rear end oli' said tube in the rear end portion of said cylinder, a valve-seat controlling the entrance to said tube, a valve-stem provided with a plug-valve at its inner end axially mounted in said rear cylinder-head in operative engagement with said valve-seat, a spring arranged to normally hold said plug'- valve and stein normally against said valveits length projecting slidably through said bushing and into the axial aperture ol said piston, means for releasably securing the opposite end of said tube at the rear end oi' said cylinder, a valve-controlled inlet to said tube, a valve arranged in said rear cylinder-head to control said inlet, means including a spring for holding' said valve normally closed, means including a port extending from said cylinders valve-chest to said valve to admita supply ol' the rock-drillingengines actuating fluid iiowing continuously to said valve when said drilling-engine is in operation for holding said valve open when said rock-drilling engine is in operation, and a water-inlet in said cylinder-head registering with said tube-inlet, substantially as described.

13. ln a rock-drilling engine, the combination with the cylinder and the hammer-piston provided with an y axial aperture extending th rough it, of a rear cylinder-head detachably secured to said cylinder, a dislr secured between said rear cylinder-head and said cylinder, a water-conveying tube releasably secured at one end Ato said dish and having' its opposite end projecting loosely into the axial aperture in said piston, a valve-seat arranged in said disk to valve and stem reciprocally mounted in said rear cylinder-head in operative engagement with said valve-seat and extendingthrough and beyond said cylinder-head, a handle on thc outer end of said'valve-stcm, a collar on said val 've-stem, means including' a spring arranged to bear against said collar t'or normally holding said plug-valve and stem against said seat, means for adjusting the tension ol'I said spring, a partition in said rear cylinder-head positioned between said collar and said valve-seat vin which one end of rear cylinder-head between said partition and the collar on said valve-stem and a port extendingirom the valve-chestotl said cylinder "to between said partition and the adjacent end oi' said piston, and arranged and adapted to convey a portion of the drilling-engines actuating iluid to said valve-stems piston where by the engines actuating 'fluid when the drillingengine is started up and is held open while said drilling-engine is in operation and is closed by said spring when said drilling-engines actuating 'lluid is shut olii'and the engine is stopped and a water-inlet in said rear cylinder-head leading to the valve-controlled inlet to said tube, substantially as described.

la. lin a rock-drilling engine, the combination with the cylinder, the piston and the drillbit, of a rear cylinder-head detachab'ly secured to said cylinder, an aperture in the cylinder end of said cylinder-head, a disk secured ed toconvey a portion ot' the actuating duid of said engine to said valve-stem and for moving said valve-stem and its plug-valve end away from said seat, and lor holding said valve open while said actuating duid is operating said rock-drilling engine, land a waterinlet in said rear cylinder-head registering with the inlet to said tube, substantially as described. s

12. lin a rock-drilling engine, the combination with the cylinder and the piston, provided with an axial aperture in said piston, ol a rear cylinder-head removably secured to said cylinder, a bushing in said aperture, a water-conveying tube having one end and a portion ol' a taper aperture in said disk, a taperplug litting in said aperture provided wlth an axial l'orin the entrance to said tube, a plugsaid valve-stem is slidably mounted, a piston reciprocally mounted 1n said the valve at the inlet to said tube is opened by` between said cylinder and said cylinder-head, v

rofl

IOEl

IIC

i hollow hub through said disk, a hollow plug i aperture, slots in said plug extending from its aperture through its peripheral surface, a pipe having one end litting into the aperture in said plug and its opposite end extending i loosely through said cylinder into said drillbit, means for securing the end oi' said pipe in said plug, a valve-seat entrance to said pipe 3 in the opposite end oi' said plug, a suitable valve arranged to control the entrance to said pipe, means for closing and for holding said valve closed when said drilling-engine is not in operation, means for opening and for holding said valvel open when said drilling-engine is in operation, and a water-inletin said cylinder-head registering with said valved entrance to said pipe, substantially as described. 15. in a rock-drilling engine the combination with the cylinder, the piston-hammer, the hollow d rill-bit operatively secured to said cylinder in striking relation to said piston-hamv mer and the rear cylinder-head removably ati tac-hed to said cylinder-head and having an axial bore in its cylinder end ci' a disk secured between said cylinder-head and said cylinder provided with a hollow hub portion extending 1 into the bore ot' said cylinder-head, a circumferentiai recess round said huh, transverse or 1 radial apertures extending' through said huh l from the bottom oi said recess into its hollow g interior and a screen secured round said hub l 'over said circumferential recess, andA aperl tures, substantially as described.

16. In a rock-drilling engine, the combinal tion with the cylinder, the piston-hammer, the hollow drill-bit operatively secured to said c vli inder in striking relation to said piston-hammer and the rear cylinder-head removably ati tached to said cylinder-head and having an axial bore in its cylinder end, ot a disk secured between said cylinder-head and said cylinder provided with a hollow hub portion extending into the bore of said cylinder-head, a circumferential recess round said hub, transverse or radial apertures extending through said hub from the bottom of said recess into its hollow interior and a screen secured round said hub l 0ver said circumferential recess, and apertures, an axial aperture extending' from said I in said -aperture, a pipe. extending loosely l, through said piston into the end ot' said drillbit and havingV its opposite end projecting i into said plug` and means for securing tlie end of said pipe in said plug, a valve-controlled entrance within said hollow hub in said plug, a water-inlet in said cylinder-head connecting 1 with the bore in said cylinder-head surrounding the hub of said disk and means for closing and holding said valve-controlled entrance to said plug and pipe closed when said drillingengine is not in operation and for opening said `alalve-controlled entrance and holding it open when said drilling-engine is in operation, substantially as described.

17. in a rock-drilling engine., the combina- '1 i said hollow hub through said disk,

tion with the cylinder, the piston-hammer. the hollow drill-bitoperatively secured to said cylinder in striking relation to said piston-hammer and the rear cylinder-head removably attached to said cylinder and having an axial bore in its cylinder end, ot' a disk secured between said cylinder-head and said cylinder, provided with a hollow hub portion extending into the bore oilslid cylinder-he:ul` a circumt'erential recess round Said hub, transverse or radial apertures extending through said hub from the bottom or' said recess into its hollow interior and a screen secured round said hub over said circumferential recess, and apertures, an axial aperture extending from a hollow plug in said aperture, a pipe extending' loosely through said piston into the end oi' said drillbit and having its opposite end projecting into said plug, and means for securing the end oi said pipe in said plug, a valve-seat in the end oi' said plug adjacent to said disks. hollow hub, an axial bore m the rear end olY said cylinder-head a partition between the rear bore ot' said cylinder-head and the bore in its cylinder end, an axial aperture in said partition, a nut threaded in the rear bore ot' said cylinder-head, a valve-stein slidably mounted in the nut and said partition provided with a valve at its end adapted to register against the valve-seat in said plug, a

l, cupped washer surrounding said valve-stem and secured between the hub of said disk and 5 said partition, a water-inlet in said cylinderhead connecting with the bore in said c vlinder-head that surrounds the hub oi' said disk, means including a spring for holding said valve closed when said drilling-engine is not in operation, and means including a. port, whereby a supply of the drilling-engines actuating iluid for `opening and holding said valve open when said drilling-engine is in operation, substantially as described.

18. in a rock-drilling engine, the combination with the cylinder, thepiston-hammer, the hollow drill-bit operativelyT secured to said cyl-- inder in striking relation to said piston-hammer and the rear cylinder-headremovably attached to said cylinder and having an axial bore in its cylinder end, ot' a disk secured between said cylinder-head and said cylinder, provided with a hollow hub portion extending i into the bore of said cylinder-head, a circumsaid plug, and means ior securing the end of sald pipe in said plug, a valve-seat inthe end IOO IIO

Lis

`seat in said plug inder-head and arranged to Vtion with the cylinder, the

vsaesa of said plug adjacent to said disks hollow hub, an axial bore in .the rear end oi' said cylinderhead, a partition between the rear bore oi' said cylinder-head and the bore in its cylinder end, an axial aperture in said partition, a nut threaded in the rear bore of said cylinder head, a valve-stem slidably mounted in the nut and said partition provided with a valve at its end adapted to register against the valvea cupped washer surround ing said valvestetn and secured between the hub oi' said disk and said partition, a water inlet in said cylindenhead connecting with the bore in said cylinderhead that surrounds the hub ot' said disk, a collar on said valve-stein between said partition and said nut, ancre pansive coiled spring around said stein be tween said nut and said collar adapted to hold said valve and stem against the entrance-seat in said plug, a piston slidably inounted in the rear end bore in said cylinder-head between said partition and said collar and a port or passage extending from the rear end bore oi.I said cylindenhead adjacent to said partition and the adjacent end oi' said piston to said cylinders valve-chests airinlet port whereby when the drilling-engine is not in operation said spring holds said valve closed, and when said drilling-engine is started up, the air ilow ing to the saidpiston opens and holds said valve open while said drilling-engine is run ning, substantially as described.

19, ln a roclndrilling engine, the combina tion with the cylinder, the piston and the drill bit, of the rear cylinderhead and the ring threaded to the end of said cylinder and arranged to clamp said cylinder-head to said cylinder, a water-inlet in said cylindenhead, a pipe supported at one end between said cylindex-head and said cylinder and projecting' loosely through said piston into said a valve operatively mounted in said rear cyl control the enu trance to said pipe and projecting through and beyond said cylinderhead, a spring arranged to. normallyA hold said valve closed, means including an air-port extending frein said valve to said cylinders valve-chest for opening' and holding said valve open when said drilling-engine is in operation and aliandle secured to the outer end of said valven stem adapted to permit said valve to b e manu ally opened and rotated on its seat, and a wa ter-inlet in said cylinderh ead connecting' with said'valve-controlled entrance te said pipe, substantially as described.

S20. ln aioclr-clrilling engine, the combina tion with the cylinder, the piston, the rear cylinderhead and the clamping-ring, et the valve stern, the thilnblenut stantially as described. v

21. ln a rock-drilling engine, the combinapiston, the rear cyla water-inlet and inder-head provided with i the ciampingring,oi the valve-stein, the thiin drillbit,

and Vthe spring, sub

l i l l end oi.E said plug, the valve vmlll,

blenut threaded into the end of said cylinderhead and provided with a check-nutadapted to secure said thinible-nut in adjusted posi tions., the valvesteins pistou, the cupped washer on said valve-stem, the disk secured between said cylinder and said rear cylinder head, the pipediolding plug secured in said disk and provided with a valve-seat arranged in operative relation to said valve-stein, sub.- stantially as described.

22. ln a rock-drilling engine, the combina tion with the cylinder, the piston and the hollowdrill-bit, of the rear cylinder-head pro vided with a water-inlet, the ring tor securing said cylinder-head to said cylinder, the dislr secured between said cylinder-head and said cylinder, an aperture in said dish, a ta per plug extending through said dislija thread and nut on the cylinder end of said plug, an aperture through said plug, slots through the periphery of said plug, a valve-seat in the seated in said cyl inder-head and in said plug, the water-pas sage frein said valved entrance to said plug to said waterdniet ot said cylinder-head and the water-pipe clamped to said split plug by said piston into said hollow drill-bit, substantially as described.

23. in a rock-drilling engine, the combination with the cylinder, the piston, the drill-bit, the rear cylinder-head and the ring arranged to removably secure said cylinder-head to said cylinder, oi' a disk clamped between said cylinder and said cylinder-head, a hub on said disk projecting into said head, a waterphain ber in said cylinderhead surrounding said hub, a water-inlet in said cylinderdiead con nesting with the water-chamber surrounding said hub, waterpassages extending through the shell et said hub into its interior, ascreen over said waterpassages, a removable valveseat plug` in the axial center of said disk provided with an axial bore, a watenconveying pipe extending at one end into said valve-scat plug, means tor removably securing said pipe to said valve-seat plug and having its oppo site end projecting loosely through said piston into said drill-bit, a plug-valve and stein ar ranged in said cylinder to operatively engage the valve-seat in said plug, and control the water-inlet to said waterpipe, means for paclr ing said valvestein, a spring arranged to normally hold said plugwalve closed, and ineans including an air-port extending from said valve through said rear cylinderhead to the air-supply port oi said drilling-engine, where* by a supply of the drilling-engines actuating compressed air is admitted to open and to continuously hold open said water-inletvalve when air is turned on to start said roclcdrilling engine and while the sanne is in operation, substantially as described.

2l. lin a 1ockdrilling engine, the combina tion with a cylinder, an operative piston re- 4said nut atene end, extending loosely through IIO i@ Vaive mxanged in the rear end; of said cylincip'mcally mounted in said cylinder, a roekder and erienged m adapted to control the eutmg drm-blt operafmvely suppol'ted bysald Water entrance te said pipe or passage, subcylinder in the reciprocal striking path of Said l stantaly as described.

in testimony whereof i ax my signature 1n 1 piston and provided Wih a u-passage eX- endlng to lts cutmng-pomt, of a Water-mlet presence of two Wltnesses. a h rear nd of said e hd a w ern= v v f t t. a e yl ai" et @Q g Jem dem@ Mmmm. veylng pipe 012 passage m Seld cylinder ar- X ranged and adapted to opeetlveyeonvey Wzl Witness-es:

te? to the Huid` assesre in said dril-bt CLARENCE A. LWSON.,

a 7 v v* (vv 7 LUTHER YGANT, m". 

